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package Test;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.swing.Icon;
import javax.swing.JLabel;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableModel;

/**
 *
 * @author myguel
 */
@SuppressWarnings({"synthetic-access", "serial"})
public final class TableSorter extends AbstractTableModel {

    public static final int DESCENDING = -1;
    public static final int NOT_SORTED = 0;
    public static final int ASCENDING = 1;
    private static Directive EMPTY_DIRECTIVE = new Directive(-1, NOT_SORTED);
    public static final Comparator COMPARABLE_COMAPRATOR = new Comparator() {

        @SuppressWarnings("unchecked")
        @Override
        public int compare(Object o1, Object o2) {
            return ((Comparable) o1).compareTo(o2);
        }
    };
    public static final Comparator LEXICAL_COMPARATOR = new Comparator() {

        @Override
        public int compare(Object o1, Object o2) {
            return o1.toString().compareTo(o2.toString());
        }
    };
    protected TableModel tableModel;
    private Row viewToModel[];
    private int modelToView[];
    private JTableHeader tableHeader;
    private MouseListener mouseListener;
    private TableModelListener tableModelListener;
    private Map columnComparators = new HashMap();
    private List sortingColumns = new ArrayList();

    public TableSorter() {
        this.mouseListener = new MouseHandler();
        this.tableModelListener = new TableModelHandler();
    }

    public TableSorter(TableModel tableModel) {
        this();
        setTableModel(tableModel);
    }

    public TableSorter(TableModel tableModel, JTableHeader tableHeader) {
        this();
        setTableHeader(tableHeader);
        setTableModel(tableModel);
    }

    private void clearSortingState() {
        viewToModel = null;
        modelToView = null;
    }

    public TableModel getTableModel() {
        return tableModel;
    }

    public void setTableModel(TableModel tableModel) {

        if (this.tableModel != null) {
            this.tableModel.removeTableModelListener(tableModelListener);
        }

        this.tableModel = tableModel;

        if (this.tableModel != null) {
            this.tableModel.addTableModelListener(tableModelListener);
        }

        clearSortingState();
        fireTableStructureChanged();
    }

    public JTableHeader getTableHeader() {
        return tableHeader;
    }

    public void setTableHeader(JTableHeader tableHeader) {

        if (this.tableHeader != null) {
            this.tableHeader.removeMouseListener(mouseListener);

            TableCellRenderer defaultRenderer = this.tableHeader.getDefaultRenderer();

            if (defaultRenderer instanceof SortableHeaderRenderer) {
                this.tableHeader.setDefaultRenderer(
                        ((SortableHeaderRenderer) defaultRenderer).tableCellRenderer);
            }
        }

        this.tableHeader = tableHeader;

        if (this.tableHeader != null) {
            this.tableHeader.addMouseListener(mouseListener);
            this.tableHeader.setDefaultRenderer(new SortableHeaderRenderer(
                    this.tableHeader.getDefaultRenderer()));
        }
    }

    public boolean isSorting() {
        return !sortingColumns.isEmpty();
    }

    private Directive getDirective(int column) {

        for (int i = 0; i < sortingColumns.size(); i++) {
            Directive directive = (Directive) sortingColumns.get(i);

            if (directive.column == column) {
                return directive;
            }
        }

        return EMPTY_DIRECTIVE;
    }

    public int getSortingStatus(int column) {
        return getDirective(column).direction;
    }

    private void sortingStatusChanged() {
        clearSortingState();
        fireTableDataChanged();

        if (tableHeader != null) {
            tableHeader.repaint();
        }
    }

    @SuppressWarnings("unchecked")
    public void setSortingStatus(int column, int status) {
        Directive directive = getDirective(column);

        if (directive != EMPTY_DIRECTIVE) {
            sortingColumns.remove(directive);
        }

        if (status != NOT_SORTED) {
            sortingColumns.add(new Directive(column, status));
        }

        sortingStatusChanged();
    }

    protected Icon getHeaderRendererIcon(int column, int size) {
        Directive directive = getDirective(column);

        if (directive == EMPTY_DIRECTIVE) {
            return null;
        }

        return new Arrow(directive.direction == DESCENDING, size,
                sortingColumns.indexOf(directive));
    }

    private void cancelSorting() {
        sortingColumns.clear();
        sortingStatusChanged();
    }

    @SuppressWarnings("unchecked")
    public void setColumnComparator(Class type, Comparator comparator) {

        if (comparator == null) {
            columnComparators.remove(type);
        } else {
            columnComparators.put(type, comparator);
        }
    }

    protected Comparator getComparator(int column) {
        Class columnType = tableModel.getColumnClass(column);
        Comparator comparator = (Comparator) columnComparators.get(columnType);

        if (comparator != null) {
            return comparator;
        }

        if (Comparable.class.isAssignableFrom(columnType)) {
            return COMPARABLE_COMAPRATOR;
        }

        return LEXICAL_COMPARATOR;
    }

    private Row[] getViewToModel() {

        if (viewToModel == null) {
            int tableModelRowCount = tableModel.getRowCount();
            viewToModel = new Row[tableModelRowCount];

            for (int row = 0; row < tableModelRowCount; row++) {
                viewToModel[row] = new Row(row);
            }

            if (isSorting()) {
                Arrays.sort(viewToModel);
            }
        }

        return viewToModel;
    }

    public int modelIndex(int viewIndex) {
        return getViewToModel()[viewIndex].modelIndex;
    }

    private int[] getModelToView() {

        if (modelToView == null) {
            int n = getViewToModel().length;
            modelToView = new int[n];

            for (int i = 0; i < n; i++) {
                modelToView[modelIndex(i)] = i;
            }
        }

        return modelToView;
    }

    // TableModel interface methods
    @Override
    public int getRowCount() {
        return (tableModel == null) ? 0 : tableModel.getRowCount();
    }

    @Override
    public int getColumnCount() {
        return (tableModel == null) ? 0 : tableModel.getColumnCount();
    }

    @Override
    public String getColumnName(int column) {
        return tableModel.getColumnName(column);
    }

    @SuppressWarnings("unchecked")
    @Override
    public Class getColumnClass(int column) {
        return tableModel.getColumnClass(column);
    }

    @Override
    public boolean isCellEditable(int row, int column) {
        return tableModel.isCellEditable(modelIndex(row), column);
    }

    @Override
    public Object getValueAt(int row, int column) {
        return tableModel.getValueAt(modelIndex(row), column);
    }

    @Override
    public void setValueAt(Object aValue, int row, int column) {
        tableModel.setValueAt(aValue, modelIndex(row), column);
    }

    // Helper classes
    private class Row implements Comparable {

        private int modelIndex;

        public Row(int index) {
            this.modelIndex = index;
        }

        @SuppressWarnings("unchecked")
        @Override
        public int compareTo(Object o) {
            int row1 = modelIndex;
            int row2 = ((Row) o).modelIndex;

            for (Iterator it = sortingColumns.iterator(); it.hasNext();) {
                Directive directive = (Directive) it.next();
                int column = directive.column;
                Object o1 = tableModel.getValueAt(row1, column);
                Object o2 = tableModel.getValueAt(row2, column);

                int comparison = 0;

                // Define null less than everything, except null.
                if ((o1 == null) && (o2 == null)) {
                    comparison = 0;
                } else if (o1 == null) {
                    comparison = -1;
                } else if (o2 == null) {
                    comparison = 1;
                } else {
                    comparison = getComparator(column).compare(o1, o2);
                }

                if (comparison != 0) {
                    return (directive.direction == DESCENDING) ? -comparison
                            : comparison;
                }
            }

            return 0;
        }
    }

    private class TableModelHandler implements TableModelListener {

        @Override
        public void tableChanged(TableModelEvent e) {

            // If we're not sorting by anything, just pass the event along.
            if (!isSorting()) {
                clearSortingState();
                fireTableChanged(e);

                return;
            }

            // If the table structure has changed, cancel the sorting; the
            // sorting columns may have been either moved or deleted from
            // the model.
            if (e.getFirstRow() == TableModelEvent.HEADER_ROW) {
                cancelSorting();
                fireTableChanged(e);

                return;
            }

            // We can map a cell event through to the view without widening when
            // the following conditions apply:
            //
            // a) all the changes are on one row (e.getFirstRow() ==
            // e.getLastRow()) and, b) all the changes are in one column
            // (column != TableModelEvent.ALL_COLUMNS) and, c) we are not
            // sorting on that column (getSortingStatus(column) ==
            // NOT_SORTED) and, d) a reverse lookup will not trigger a sort
            // (modelToView != null)
            //
            // Note: INSERT and DELETE events fail this test as they have column
            // == ALL_COLUMNS.
            //
            // The last check, for (modelToView != null) is to see if
            // modelToView is already allocated. If we don't do this check;
            // sorting can become a performance bottleneck for applications
            // where cells change rapidly in different parts of the table. If
            // cells change alternately in the sorting column and then
            // outside of it this class can end up re-sorting on alternate
            // cell updates - which can be a performance problem for large
            // tables. The last clause avoids this problem.
            int column = e.getColumn();

            if ((e.getFirstRow() == e.getLastRow())
                    && (column != TableModelEvent.ALL_COLUMNS)
                    && (getSortingStatus(column) == NOT_SORTED)
                    && (modelToView != null)) {
                int viewIndex = getModelToView()[e.getFirstRow()];
                fireTableChanged(new TableModelEvent(TableSorter.this,
                        viewIndex, viewIndex, column, e.getType()));

                return;
            }

            // Something has happened to the data that may have invalidated the
            // row order. @Changed by CODERAZZI: in the original implementation,
            // this change triggers a full re-sorting, which eventually triggers
            // a new filtering. However this is not the behavior in Java 6; in
            // Java 6, the update of a row does not update the sorting or the
            // filtering, so we need now to do NOTHING clearSortingState();
            fireTableChanged(e);

            return;
        }
    }

    private class MouseHandler extends MouseAdapter {

        @Override
        public void mouseClicked(MouseEvent e) {
            JTableHeader h = (JTableHeader) e.getSource();
            TableColumnModel columnModel = h.getColumnModel();
            int viewColumn = columnModel.getColumnIndexAtX(e.getX());
            int column = columnModel.getColumn(viewColumn).getModelIndex();

            if (column != -1) {
                int status = getSortingStatus(column);

                if (!e.isControlDown()) {
                    cancelSorting();
                }

                // Cycle the sorting states through {NOT_SORTED, ASCENDING,
                // DESCENDING} or {NOT_SORTED, DESCENDING, ASCENDING} depending
                // on whether shift is pressed.
                status = status + (e.isShiftDown() ? -1 : 1);
                status = ((status + 4) % 3) - 1; // signed mod, returning
                // {-1, 0, 1}
                setSortingStatus(column, status);
            }
        }
    }

    private static class Arrow implements Icon {

        private boolean descending;
        private int size;
        private int priority;

        public Arrow(boolean descending, int size, int priority) {
            this.descending = descending;
            this.size = size;
            this.priority = priority;
        }

        @Override
        public void paintIcon(Component c, Graphics g, int x, int y) {
            Color color = (c == null) ? Color.GRAY : c.getBackground();

            // In a compound sort, make each succesive triangle 20%
            // smaller than the previous one.
            int dx = (int) (size / 2 * Math.pow(0.8, priority));
            int dy = descending ? dx : -dx;

            // Align icon (roughly) with font baseline.
            y = y + (5 * size / 6) + (descending ? -dy : 0);

            int shift = descending ? 1 : -1;
            g.translate(x, y);

            // Right diagonal.
            g.setColor(color.darker());
            g.drawLine(dx / 2, dy, 0, 0);
            g.drawLine(dx / 2, dy + shift, 0, shift);

            // Left diagonal.
            g.setColor(color.brighter());
            g.drawLine(dx / 2, dy, dx, 0);
            g.drawLine(dx / 2, dy + shift, dx, shift);

            // Horizontal line.
            if (descending) {
                g.setColor(color.darker().darker());
            } else {
                g.setColor(color.brighter().brighter());
            }

            g.drawLine(dx, 0, 0, 0);

            g.setColor(color);
            g.translate(-x, -y);
        }

        @Override
        public int getIconWidth() {
            return size;
        }

        @Override
        public int getIconHeight() {
            return size;
        }
    }

    private class SortableHeaderRenderer implements TableCellRenderer {

        private TableCellRenderer tableCellRenderer;

        public SortableHeaderRenderer(TableCellRenderer tableCellRenderer) {
            this.tableCellRenderer = tableCellRenderer;
        }

        @Override
        public Component getTableCellRendererComponent(JTable table,
                Object value,
                boolean isSelected,
                boolean hasFocus,
                int row,
                int column) {
            Component c = tableCellRenderer.getTableCellRendererComponent(table,
                    value, isSelected, hasFocus, row, column);

            if (c instanceof JLabel) {
                JLabel l = (JLabel) c;
                l.setHorizontalTextPosition(SwingConstants.LEFT);

                int modelColumn = table.convertColumnIndexToModel(column);
                l.setIcon(getHeaderRendererIcon(modelColumn,
                        l.getFont().getSize()));
            }

            return c;
        }
    }

    private static class Directive {

        private int column;
        private int direction;

        public Directive(int column, int direction) {
            this.column = column;
            this.direction = direction;
        }
    }
}
